trapdoor5

Imported from GitHub: jmA500/trapdoor5 · commit 445948e · license GPL-2.0

Description

A flexible trapdoor extension for the AMIGA 500

README

This repository contains all the files to construct a Trapddor expansion for the Amiga 500. There are some variants available. For more information see the project website:

 https://www.jm27.de/for-commodore-amiga-500-1-8-mb-2mb-trapdoor-memory-expansion/

One variant uses a universal GARY Adapter (T3), the second one a spcialized GARY adapter (T4). The T3 variant has as a main benefit that the GARY adapter can be used with other original memory expansion boards using a 74'139 to multiplex the CAS lines. The T4 version's main feature is that there is no exra connection needed between the GARY adapter and the Trapdoor board.

Directories:

• doc: some documentation, needs to be extended

• pcb-trapdoor: kicad files for the pcb for the trapdoor assembly, both variants

• gal-trapdoor: Source and JED files for the GAL used on the trapdoor board CBR5SEL is needed for the T3 variant of the GARY adapter, CBR5EX is for the T4 variant -pcb-gary-sel: the T3 GARY adater, kicad files -pcb-gary-ext: the T4 GARY adapter, kicad files

• gal-gary: the corresponding GAL files GARY-T3: for the T3 variant GARY-T4: for the T4 variant

The PLD files can be compiled with WinCUPL available from Microchip. I would be grateful fo a suggestion of a free alternative.